/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesInterface/Public/Online/Lobbies.h
Change the attributes applied to the lobby. Only the lobby leader may change the lobby attributes. Attributes are validated against the lobby schema before an update can succeed.
[TOnlineAsyncOpHandle](API\Plugins\OnlineServicesInterface\Online\TOnlineAsyncOpHandle)< [FModifyLobbyAttributes](API\Plugins\OnlineServicesInterface\Online\FModifyLobbyAttributes) > ModifyLobbyAttributes ( [FModifyLobbyAttributes::Params](API\Plugins\OnlineServicesInterface\Online\FModifyLobbyAttributes\Params) && Params )